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The climate throughout the state of Illinois is fairly consistent and considered temperate, which means that four distinct seasons are experienced. The northeastern part of the state (which borders Lake Michigan) is the only area that experiences weather patterns inconsistent to those of the rest of the state. These inconsistencies are due to the Lake Effect. In general across the state, average temperatures are warmer in the south when compared to the north. Visit the
Climate of Illinois page for detailed information about this topic.
The northern region of the state (surrounding the city of Rockford) experiences summer weather that is fairly comfortable. The hottest months of the year are July and August, during which time the daily high temperatures will reach the mid to upper 80’s. The summer months are also the rainiest, which adds to the humidity in the air. The winter months however are very cold. From December until February the temperatures rarely rise above the freezing point.
Just like the northern region, the central region of the state also experiences hot summers and cold winters. To give a better idea, we will look ate the state’s capital, Springfield. The hottest months in Springfield are again July and August, during which time the high temperatures will be in the lower 90’s. Winters are bitterly cold, but daytime temperatures may get above freezing during the month of December.
For detailed information about any of the state’s major cities or towns, visit the
Weather Channel website.